#include <stdio.h>

int main(int argc, char const *argv[])
{
    //printf("age:%d\n",age);
    int age=18;
    printf("age:%d\n",age);
    age = 20;
    printf("age:%d\n",age);
    int score = 59;
    {
        int score=90; // 该变量只能在自己的作用域范围{}访问
        printf("score:%d\n",score);
    }
    // 不能访问
    printf("score:%d\n",score);
    //int score=99;
    return 0;
}
